#include<iostream>

using namespace std;

int add(int x, int y);
int sub(int x, int y);

int main()
{
    int x = 4, y = 3;

    cout << x << " + " << y << " = " <<  add(x, y) << endl;

    cout << x << " - " << y << " = " <<  sub(x, y) << endl;

    return 0;
}
